Creating Burner Accounts and Promptly Deleting Them
The screenshot doesn't make it apparent, but the user self-deleted that account.
As a user, it's annoying when there's good conversations in the comments that just disappear forever.
As an instance admin, it's annoying to have that inaccessible stuff just taking up space until it maybe, eventually gets garbage collected months later (except any thumbnails/media....that lives forever wasting space 😠)